How severe is CVE-2026-28256?

CVE-2026-28256 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-28256 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-28256?

CVE-2026-28256 primarily affects Trane Tracer Concierge. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-28256?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-28256 have an EU (EUVD) identifier?

Yes. CVE-2026-28256 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11637.

When was CVE-2026-28256 published?

CVE-2026-28256 was published on 2026-03-12 and last updated on 2026-06-17.

CVE-2026-28256

CVE-2026-28256 is a critical-severity vulnerability in Trane Tracer Concierge with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-547.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 6.9
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-11637
Weakness: CWE-547
Affected product: Trane Tracer Concierge
Published: 2026-03-12
Last modified: 2026-06-17

Description

A Use of Hard-coded, Security-relevant Constants vulnerability in Trane Tracer SC, Tracer SC+, and Tracer Concierge could allow an attacker to disclose sensitive information and take over accounts.

Frequently asked questions

What is CVE-2026-28256?: A Use of Hard-coded, Security-relevant Constants vulnerability in Trane Tracer SC, Tracer SC+, and Tracer Concierge could allow an attacker to disclose sensitive information and take over accounts.
How severe is CVE-2026-28256?: CVE-2026-28256 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-28256 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-28256?: CVE-2026-28256 primarily affects Trane Tracer Concierge. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-28256?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-28256 have an EU (EUVD) identifier?: Yes. CVE-2026-28256 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11637.
When was CVE-2026-28256 published?: CVE-2026-28256 was published on 2026-03-12 and last updated on 2026-06-17.

References

https://www.cisa.gov/news-events/ics-advisories/icsa-26-071-01

Affected products (9)

cpe:2.3:o:trane:tracer_sc\+_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:trane:tracer_sc_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:trane:tracer_sc_firmware:4.4:service_pack1:*:*:*:*:*:*
cpe:2.3:o:trane:tracer_sc_firmware:4.4:service_pack2:*:*:*:*:*:*
cpe:2.3:o:trane:tracer_sc_firmware:4.4:service_pack3:*:*:*:*:*:*
cpe:2.3:o:trane:tracer_sc_firmware:4.4:service_pack4:*:*:*:*:*:*
cpe:2.3:o:trane:tracer_sc_firmware:4.4:service_pack5:*:*:*:*:*:*
cpe:2.3:o:trane:tracer_sc_firmware:4.4:service_pack6:*:*:*:*:*:*
cpe:2.3:a:trane:tracer_concierge:*:*:*:*:*:*:*:*

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